1Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA2Biostatistics and Epidemiology Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV 26505, USA3The University of Chicago Comprehensive Cancer Center, The University of Chicago, Chicago, IL 60637, USA4Department of Social and Preventive Medicine, School of Public Health and Health Professions, The State University of New York at Buffalo, Buffalo, NY 14214, USA